Electricity: motive power systems – Open-loop stepping motor control systems
Patent
1989-06-12
1990-08-07
Shoop, Jr., William M.
Electricity: motive power systems
Open-loop stepping motor control systems
318685, 74553, 307116, H02P 800
Patent
active
049470973
ABSTRACT:
A rotary control knob is adapted to provide for automatic switching between two modes of movement control for a tape transport. An insulative ring surrounds a conductive knob, and the conductive knob is electrically connected to an oscillator circuit. Changes in the oscillator frequency due to operator contact with the conductive knob during movement of the knob are sensed to produce one mode of movement control, while movement of the knob due to operator contact with the insulative ring do not affect the oscillator frequency and indicate an alternative, default mode of movement control. A stepper motor is mechanically coupled to the control knob, and is electrically engaged in the default mode and disengaged in the one mode. In the default mode when the control knob reaches a predetermined control limit, a brake signal is generated that increases the current in the coils of the stepper motor, the increase in current resulting in increased resistance to movement of the control knob to provide tactile feedback to the operator.
REFERENCES:
patent: 4012966 (1972-03-01), Liebermann et al.
patent: 4037490 (1977-07-01), Wilson
patent: 4050265 (1977-09-01), Drennen et al.
patent: 4553080 (1985-11-01), Cannon et al.
patent: 4652805 (1987-03-01), Kohn
Bergmann Saul M.
Gray Francis I.
Shoop Jr. William M.
The Grass Valley Group Inc.
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